Ball-bearing spring caster



Jan. 13, 1931.

4 I; w Eifi GREEN BALL BEARiNG SPRING CASTER Fi led Oct. 6, 1927 fillfenr r .299 Green f ar Patented Jan, 13; 1931 LEE GREEN, or cHIcAGo, ILLINOIS,

: BALL-BEARING SPRING- CASTER Application filed October 6, 1927. Serial No. 224,377.

' The object of my invention is to provide 1 a a ball-bearing caster thatwill carry its load yieldingly and will also adjust itself, in a measure, to variations in the floor level on which it rests. In the form shown in the drawings it is particularly adapted for: use

on garage doors.

' In the drawing, F 1g. 1 1s aside elevation of my device with the protective cap partial- 1y broken away, and Fig. 2 is a front elevas tion of my device'with the protective cap in position. p

' Referring" to the drawing, a-metallic frame 10 is firmly attached, by means of set screws 11, to a door 12. In frame '10 is mounted a smooth round metallic rod 13 -to the lower end of whichthere is-firmly attached a caster 14, forming with its upper end a shoulder 15 around rod 13. On rod 13 there is also mounted a ball-bearing 16 and a compression spring 17 Rod 13 isrprovided with a series of horizontal holes 18 near its upper end, and with a. series of like holes 19 some distance above its lower end. Cotterpin 20 is inserted into one of holes 18, and cotterpin 21' is insertedinto one of holes 19. The purpose of holes 18 is primarily to permit vertical adjustment of my caster with reference to frame 10 and door'12 by placing pin 20 higher or lower. The purpose of holes 19 is primarily to permit adjustment ofthe tension of spring 17; but by placing pin'21 higher or lower when cotterpin 20 is with Iclaimi I In a ball-bearing spring caster, the combination of a bracket adapted to be connected to an object to be supported,. and provided with horizontal arms; a vertical shaft slidably enteredin openings in said arms openings near itsupper and its lower end; a caster mounted on the lowerfend of the shaft; a ball bearing slidablymounted' on said shaft above the lower arm of the bracket; acompression spring mounted on the shaft between the ball bearing and the upper arm of the bracket; and cotter-pins entered, in the shaft above the upper arm of the bracket, and below the ball bearing re spectively; substantially as and for the purpose described.

1 LEE GREEN.

drawn from holes 18, or is placed very high, 1

cotterpin 21 may also serve to limit the down 1 ward movement of rod 13 and caster 14. 'In any event the pressure of spring 17 is transmitted through'bearinglG and cotterpin 21 to rod 13 and caster 14. p p

For the purpose of protecting'my device y from the weather, from dust and from acci dental inj'ury,'I prefer to cover it bya pro- 3 tective cap" 22,-=which may be attached to a frame 10 inany suitable manner. I

It is manifest thatvthe construction-of my device might be deviatedjfrom without departing from the essentials of my invention. All such deviations I intend to cover i 1 by my claim.

and provided with a series of transverse 

